Tire.



I. B. KBMPSHALL.

TIRE.

APPLICATION FILED APR. 2. 1910.

Patented May 3, 1910.

UNITED sirnri s Parana UFFICE.

IVA BELLE KEMPSHALL, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO KEMPSHALL TIRE COMPANY, A CORPORATION OF MTAINE.

TIRE.

Patented May 3, 19.10.

Original application filed January 19, 1910, Serial No. 538,853 Divided and this application filed April 2,

1910. Serial no. 553,1?2?

To all whom it may concern:

Be it known that I, Iva BELIZE KEMP- SHALL, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Tires; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to figures of reference marked thereon, which form a part of this specification.

This invention relates to an improvement in automobile tires, and more particularly to the wear portion or shoe thereof, the object of the invention being to provide an iniproved tire so constructed as to prevent'skidding, and forms a division of my application for patent filed January 19, 1910, Serial vNo. 538853.

In the drawings accompanying and forming part of this specification, Figure 1, is a side elevation of a portion ofthis improved tire; Fig. 2 is a View of the tread portion thereof; Fig. 8 is a cross-sectional view taken in line 3-3, of Fig. 1.

Similar characters of reference indicate correspoiuling parts throue'hout the figures of the drawings.

In the form shown herein, the shoe when the tire is' of pneumatic form, or the wear member thereof when of solid form, may be made of any preferred construction, the sur face of which, however, is usually composed of rubber. In the present instance this wear member or shoe 2 is provided along its tread surface or periphery with a series of openings or recesses 3, preferably of circular formation, forming pockets. This series of pockets extends around the whole tread of the tire and forms suction chambers enabling the tire to effectively grip the road surface and prevent skidding. At each side of the tire, entirely around the same, and located in alinement with the pocketsis a series of projections 4, shown in the present instance as of substantially oval form. that is, having curved outer and inner. ends, with the outer ends of preferably larger eurvature than the inner ends. The sides or side edges, how ever, may be in practlce straighter than they are shown in the drawings without depart ing from the scope of the inventinn, each Qf 5 portion of the tire. These projections very materially reinforce the tire at the points of fieXure thereof when the same is in use, These projections, being formed in the manner set forth, have their greatest width at the point where the tire bends or flexes when under load, and furthermore, astheymerge or terminate below, or short of, the tread surface of the tire they do not form but tresses the ends of which constitute a part of the tread itself, which in practice has proved 7'" to be objectionable where there are car tracks and slots in the road bed of traction systems.

which it is necessary to frequently cross.

Heretofore, where projections have been located at the side of the tire they terminate in an abrupt surface, the ends forming a portion of the tread, and these buttresses or projections not only tend to become mutilated, but to wrench the tire and wheel when crossing a car track or slots in the roadway of street railway lines. In the present improvement, however, the projections so merge at their outer ends in the tread surface of the tire that there are no abrupt surfaces to be mutilated or catch in tracks or slots of a road-bed.

In operation, the load upon the tire depresses it, thus bringing into action one or the other of the pockets and so prevents the skidding of the tire, while the flexure points of the tire when under load are reinforced by the projections, the tire shoe having the same cross-sectioual area throughout,

except where the projections are located, at

which points the cross-sectional area of the shoe is materially increased and therefore the tire reinforced to prevent injury at the point of llexure when the tire is under load. These pro ections are also effective to prevent skidding, especially in turning corners. 1- 00 The present improvement is adapted for use for all classes ofr'esilient tires, whether solid, cushioned, or pneumatic, or otherwise, andiwhen-the invention: is appliedto a shoe the shoe will be provided. with the usual 5 means forsecuring it in place, as a bend or flange 6 forattachment to the rim. v

From the foregolng 1t Wlll be observed Outer ends ef the projections en 4 e merge shert 0f the tread thereof t mead forms with the eentinufous curve in crass ,jhus avoiding the forrupt surfaces at the termini face-11:; to the treaclf S tiee for motor-driven a. heat}. portion provided Q of chambers or poekets, the i each side t ereei' 01'1"- sw Ate m "the side of the tire, and a series {if proieetiom ieeaaed at eaehside 0f the 11 their outer ends teiminating at er; of ihe mead, a pair 05 said pro- 5 being located. in aiinement with 10 "vehicles, havi? Pr eemee 2, An anti-skidfiing tire for moter-riven vehicles,v having atread portion. eenvex in crass section, the tread pertien having each side thereof efi-set from the side of the tire, said Giisei; portions being Wholly "within. the plane 015 the outermest surface of the can /e2: tread, ami a I located at each side of the tire with their outer end terminating at the Dif -set of the tread, a pair 01" said projections being-'10- cated in aiinement with a pocket.

In testimony whereof K have signed my name is ibis specification in the presence of two eubecribing witnesses;

IVA BELLE KEMPSHALL.

Jere. imam, I

PAUL B. BRAOKETT.

series of projections r 

